Microchip HV9980DB1 Handleiding

Microchip Niet gecategoriseerd HV9980DB1

Lees hieronder de 📖 handleiding in het Nederlandse voor Microchip HV9980DB1 (8 pagina's) in de categorie Niet gecategoriseerd. Deze handleiding was nuttig voor 176 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld

Download PDF
Pagina 1/8
Supertex inc.
Supertex inc.
www.supertex.com
HV9980DB1
Doc.# DSDB-HV9980DB1
A032913
General Description
The HV9980B1 demoboard is an RGB or multi-channel
white LED backlight driver designed to drive LEDs for
a large-screen TV. The HV9980DB1 can drive three
common-anode LED strings from a 100 - 140V input at
currents up to 70mA in steady state. It can also drive the
LEDs at currents as large as 160mA for short durations to
facilitate backlight scanning mode.
Each of the three channels can be individually controlled
by PWM dimming. The demoboard is also protected from
short circuit conditions across any string and recovers
automatically once the condition disappears.
Connection Diagram
3-Channel LED Array Driver IC
Speciîš¿cations
Parameter Value
Input voltage (VIN) 100 - 140V
IC supply voltage (VDD) 6.0 - 10V
Output voltage 20V (min)
< ½ of input voltage (max)
Output current (steady state) 70mA (max)
Output current (short durations) 160mA (max)
Switching frequency (requires an
external 1.8MHz clock signal) 300kHz
REF input 0 - 1.0V
Output current ripple (typ) <5% peak - peak
Efîš¿ciency (@ 120V input and
40V, 50mA output) ~90%
Open LED protection YES
Output short circuit protection YES
Actual Board Size: 68.8mm x 36.1mm
+
-
+
-
120V
0 - 0.9V
8.0V
+
-
2
HV9980DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9980DB1
A032913
Connections
Pin Connection
VIN Powers the three LED strings, providing the LED string voltage is less than ½ of the input voltage. Connect a
high voltage 100 - 140V source at this terminal.
VDD Powers the HV9980 control circuit. Connect a 6.0 - 10V source at this terminal.
REF Voltage at the REF terminal controls the output current level. The peak inductor current is approximately 1/5th
of the REF voltage.
CLK Provides a clock input to the HV9980. The switching frequency is 1/6th of the CLK frequency. Connect a
1.8MHz TTL compatible signal at this terminal.
PWMD1-3
These inputs can be used to PWM dim the three channels. Connect these pins to VDD to enable all three
channels permanently. A TTL compatible, low frequency (<1kHz) square wave can be used to PWM dim each
channel individually.
GND(s) The two GND terminals are wired together on the board. They form the return path for all the input signals.
COM This is the common anode connection for all three LED strings.
Ch1-3 These terminals are the cathode connections for the three LED strings.
Typical Results
Efficiency vs. Input Voltage
(@V
O
= 40 IV;
O
= 50mA)
87
88
89
90
91
92
90 110 130 150
Input ltage (V)Vo
Efficiency (%)
Efficiency vs. Load ltageVo
(@V
IN
= 120V; I
O
= 50mA)
75
80
85
90
95
15 25 35 45
Load ltage (V)Vo
Efficiency (%)
Line Regulation of Output Current
(@V
O
= 40V)
49
49.5
50
90 0 130 15011
Input Voltage (V)
Output Current (mA)
Load Regulation of Output Current
(@V
IN
= 120V)
49
51
53
55
57
15 25 35 45
Load Voltage (V)
Output Current (mA)
3
HV9980DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9980DB1
A032913
Drain of channel 1
Drain of channel 2
Drain of channel 3
LED current in Channel 1
Fig. 1: Steady State Operation
(Time scale: 1.0µs/div)
Fig.1 shows the drain voltage and LED current waveforms during normal operation. The three channels are phase shifted
by 120° with respect to each other. The switching frequency for each channel is 300kHz (1/6th of the CLK frequency).
Fig. 2 shows the hiccup mode short circuit protection of the HV9980. The output of channel is shorted by connecting COM to
CH1. Channel 1 tries to restart every 200μs. The other two channels work normally and are not affected by the short circuit
on one channel. The short circuit timing is started when the voltage at RS reaches 1.15V (about 230mA).
Drain of channel 1
Drain of channel 2
Drain of channel 3
LED current in Channel 1
Fig. 2: Operation during Output Short Circuit
(Time scale: 50µs/div)

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV9980DB1

Heb je hulp nodig?

Als je hulp nodig hebt met Microchip HV9980DB1 stel dan hieronder een vraag en andere gebruikers zullen je antwoorden


Handleiding Niet gecategoriseerd Microchip

Microchip

Microchip EVB-USB2504 Handleiding

17 November 2024
Microchip

Microchip AT97SC3204 Handleiding

17 November 2024
Microchip

Microchip ATECC608B Handleiding

16 Juli 2024
Microchip

Microchip HV860 Handleiding

16 Juli 2024
Microchip

Microchip EVB-LAN9255 Handleiding

16 Juli 2024
Microchip

Microchip LX4580 Handleiding

16 Juli 2024
Microchip

Microchip LX7720 Handleiding

16 Juli 2024
Microchip

Microchip AT32UC3C0128C Handleiding

10 April 2024
Microchip

Microchip AT32UC3C1512C Handleiding

10 April 2024
Microchip

Microchip AT32UC3A3256 Handleiding

10 April 2024

Handleiding Niet gecategoriseerd

Nieuwste handleidingen voor Niet gecategoriseerd

Taga Harmony

Taga Harmony TOS-600 v.2 Handleiding

26 November 2024
Trace Elliot

Trace Elliot Pro 2x12 Cabinet Handleiding

26 November 2024
Kramer

Kramer K-Bar Camera Bracket Handleiding

26 November 2024
Kramer

Kramer RK-19 Handleiding

26 November 2024
Kramer

Kramer OSP-MM1 Handleiding

26 November 2024
Kramer

Kramer ASPEN-1616UX Handleiding

26 November 2024
Korg

Korg Pitchstrap Handleiding

26 November 2024
NeoMounts

NeoMounts WL70-450BL11 Handleiding

26 November 2024
Kramer

Kramer CLS-AOCH/60 Handleiding

26 November 2024
Klauke

Klauke EKM 6022ISM Handleiding

26 November 2024